How to collect the solvent waste gas in the sampling and testing link of pharmaceutical factory? The treatment idea of small air volume point multi-point emission
Release date: 2026-10-16
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In addition to the main processes of reaction kettle and distillation tower in pharmaceutical factories, the sampling port, laboratory analysis position and pilot sampling point are also continuously discharging solvent vapor: single point air volume is small, point position is scattered, intermittent fluctuation is easy to be missed as "trivial matters. However, there are many points and a long time, and the total amount of emissions superimposed is not small, and this kind of unorganized emissions is the short board that is easily exposed during inspection. The idea of governance is to collect and collect scattered points nearby, collect them and deal with them in a centralized way, and use a set of small-scale units to cover all scattered rows.
What are the characteristics of emissions from sampling and testing
One is the scattered points: from the raw material area to the pilot test and then to the quality inspection, different floors and different workshops have discharge points, and the pipelines are independent. The second is intermittent strong: sampling, sampling is only discharged, the concentration is instantaneously high, usually close to zero. Third, the air volume of a single point is small but there are many points: it is not economical to build a separate treatment facility at each point, and it is not in compliance with regulations. The key to receiving or not receiving is the summary method.
How to collect: nearby enclosure and directional airflow
Local exhaust hoods are installed at such operating points as sampling port and discharge port, which are opened and closed during operation to capture instantaneous high concentration steam locally. The large opening operation of the laboratory site is completed in the ventilation facility, and the exhaust air is connected to the collection main pipe nearby. The pipeline direction should be as short as possible to reduce fluid accumulation along the route.
The position where the exhaust air is connected to the main pipe shall be protected against backflow and isolation to avoid mutual interference of each branch. The branch valve at the point of non-operation shall be closed to prevent the main pipe from short circuit.
How to summarize and deal with small air volume and more points
The core of multi-point summary is air volume balance: the branch is equipped with regulating air valves, and the opening degree is approved point by point during debugging; The main fan is selected according to the total air volume and the frequency conversion margin is reserved. The frequency conversion is used to take into account the fluctuation of "small flow at ordinary times and large flow during operation. After the summary of the tail gas concentration is low, the composition is mixed, the processing unit according to the miniaturization configuration, take the "condensation of the main amount plus adsorption bottom" or "adsorption concentration after desorption condensation" route, the scale is much smaller than the main process unit, the input is also limited.
| Collection method | Applicable point | Key points |
|---|---|---|
| Local exhaust hood | Sampling port and discharge port | When operating, open and close, the hood air flow effectively covers |
| Gathering of ventilation facilities | laboratory analysis position | Do anti-backflow isolation before the exhaust air is connected to the supervisor. |
| Branch Road Summary Supervisor | Multi-point merge | The air valve is balanced point by point, preventing short circuit and backflow |
How to configure the centralized processing unit
Summary tail gas concentration is low, and the components change with the sampling varieties: the combination of condensation to collect the main amount and adsorption to the bottom is most commonly used; If the points are especially scattered and the air volume is too large, desorption and condensation are carried out after adsorption and concentration, so that the treatment unit can operate more economically under small air volume and high concentration. The specific temperature level and air volume shall be determined by the measured data, and the outlet concentration shall be remeasured periodically after operation as the basis for operation adjustment.
Key points of operation management
- The state of the branch air valve shall be included in the patrol inspection, and the valve shall be closed after the operation point is used up to prevent the normally open short circuit.
- The fan frequency conversion setting is linked with the production rhythm, and the operation peak ensures that the hood suction is effective.
- Regularly measure the concentration of the summary tube and the outlet concentration of the processing unit, and record them in the ledger.
- Adsorbent according to the adsorption amount of desorption regeneration, do not drag to the penetration.
- Drain the liquid at the low point of the pipeline regularly to prevent accumulation and blockage.
Frequently Asked Questions
With such a small air volume, is it worth building a separate processing unit?
It's worth it. Emission compliance depends on concentration and total amount, not on point size, and unorganized emission is the focus of inspection. After multi-point summary, it can be covered by a set of small units, and the investment is far lower than that of post-rectification.
The air volume at each point varies greatly, how to balance it?
The branch air valve is leveled point by point and frequency conversion of the main fan is added. In the debugging stage, the opening degree of each point is approved and listed. During operation, fine-tuning is carried out according to production changes.
Does it affect the direct access of laboratory exhaust to the recycling unit?
Before connecting to the main pipe, do a good job of preventing backflow and isolation to prevent each branch from stringing gas with each other; The amount of test position is small, the discharge is intermittent, and the impact on the main unit is limited after being imported.
Will the high instantaneous concentration of sampling impact the processing unit?
The unit shall be approved according to the most unfavorable working conditions, and the instantaneous fluctuation can be confirmed by pipeline volume and adsorption buffer absorption, and the outlet concentration shall be observed during operation.
This article is organized by Luoyang wohong petrochemical equipment co., ltd. the company provides solvent waste gas collection, condensation recovery, adsorption recovery and design, manufacturing and operation and maintenance services for complete sets of treatment devices for the pharmaceutical and fine chemical industries. if you need on-site evaluation or scheme configuration, please contact and exchange.
